/**
  * url GET /v2/groups/{group_name|group_id}/teachers
  * @api
  * @param $data
  * @return string
  * @throws ApiException
  */
 public function groups_teachersRelationAction($data)
 {
     $allowFilters = ['duplicateTeachersFilter' => true];
     $filter = $this->_fc->getFilter();
     $group_name = $data["groups"];
     $group_name = urldecode($group_name);
     $teachers = TeacherModel::getAllByGroupNameOrGroupId($group_name);
     if ($filter != null) {
         Utilities::checkFilters($filter, $allowFilters);
         $teachers = TeacherModel::teachersDuplicateFilter($teachers);
     }
     $this->data = $teachers;
     return $this->send(200);
 }